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seller's agent emailing me
First, let me say that I know we've gone about the house-hunting process all out-of-sorts. 
We had been just casually looking, going to open houses, etc. My DH had made contact with a realtor from X Real Estate but hadn't officially retained him as a buyer's agent because we didn't think we needed one yet - weren't planning to buy until next year.
Well things have fallen into place very suddenly and quickly, and we ended up looking at a house this past weekend - with the seller's agent. At the time, she told us that there were 2 other parties interested in the house. We were also interested, so I asked her if she could let us know if anyone else puts in an offer, and I gave her my email address.
So on Monday I contacted the other realtor and said we were interested in this house, would he be willing to serve as our buyer's agent? He agreed, and we signed the papers yesterday.
Also on Monday I got an email from the seller's agent with some info and I just replied with a thanks and we'll keep you updated. Today I got an email from the seller's agent with some info and signing off saying, "Give me a call if there's anything I can do to help!"
I'm not sure what, if anything, I should do here. Should I email her back and let her know we have a buyer's agent? Should I have our agent contact her? I don't want it to have to be all stuffy and formal if it doesn't need to be, but at the same time I don't know if there could be problems for DH and me if we're getting communication from both sides.
ETA: Our agent does not know that I gave my email address to the seller's agent on Sunday. I haven't been "hiding" that from him; it just didn't cross my mind to tell him. So I don't know if I need to let him know this and if that will cause hurt feelings like he'll think we were trying to go around him or something.
Re: seller's agent emailing me
You might be in a sticky situation because you saw the house with the listing agent. I'm pretty sure that agent now has procuring cause.
Did the listing agent ask if you had a buyer agent?
If you want to put an offer in on the house you saw with the listing agent, I would tell your agent right away so you can figure out your options. If the listing agent didn't ask, you might be able to play dumb and say you didn't think to mention that you already had an agent.
I think you can simply explain the listing agent that you don't want a dual agent agreement so you hired a buyer's rep to help you out. I think dual agent agreements are a bad situation because that person is equally obligated to both the buyer and seller, so he/she can never give full disclosure to either party.
Just tell the seller's agent to send info to you and your agent from now on. Agents have to be used to this.
We were involved in a dual agent situation and ended up walking away from the house and swore that we would never make that mistake again. We were never sure if the agent was doing things in our best interest or the seller's. It ended up being a huge mess. I'd definitely e-mail the seller's agent back and let her know that you already have an agent so she doesn't get the wrong idea.
After our bad experience with the dual agent we worked with a more reputable agent and he told us that he would never work as a dual agent when selling a home, and the one time that he had was when he sold a piece of land with no home on it.
You need to tell whichever agent you are going forward with that you have had some interactions with the other. Explain what happened. You do not want agents to be upset with each other (thinking one overstepped bounds, etc.) during your negotiations.
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